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Subject[PATCH 19/21] PCI: Retry on type IORESOURCE_IO allocation.
Date
During reenabling pci reallocating for pci bridge by clean the small size in
bridge and assign with requested + optional size for first several try,
Ram mention could have problem with one case
https://bugzilla.kernel.org/show_bug.cgi?id=15960

After checking the booting log in
https://lkml.org/lkml/2010/4/19/44
[regression, bisected] Xonar DX invalid PCI I/O range since 977d17bb174

We should not stop too early for io ports.
Apr 19 10:19:38 [kernel] pci 0000:04:00.0: BAR 7: can't assign io (size 0x4000)
Apr 19 10:19:38 [kernel] pci 0000:05:01.0: BAR 8: assigned [mem 0x80400000-0x805fffff]
Apr 19 10:19:38 [kernel] pci 0000:05:01.0: BAR 7: can't assign io (size 0x2000)
Apr 19 10:19:38 [kernel] pci 0000:05:02.0: BAR 7: can't assign io (size 0x1000)
Apr 19 10:19:38 [kernel] pci 0000:05:03.0: BAR 7: can't assign io (size 0x1000)
Apr 19 10:19:38 [kernel] pci 0000:08:00.0: BAR 7: can't assign io (size 0x1000)
Apr 19 10:19:38 [kernel] pci 0000:09:04.0: BAR 0: can't assign io (size 0x100)
and clear 00:1c.0 to retry again.
The patch remove the IORESOUCE_IO checking, and try one more time.
and we will have chance to get allocation for 00:1c.0 io port range because
from 0x4000 to 0x8000 could be used.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
---
drivers/pci/setup-bus.c | 12 +-----------
1 files changed, 1 insertions(+), 11 deletions(-)
diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index 3b3932a..c22be02 100644
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -1278,7 +1278,6 @@ pci_assign_unassigned_resources(void)
struct pci_dev_resource *fail_res;
unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM |
IORESOURCE_PREFETCH;
- unsigned long failed_type;
int pci_try_num = 1;

/* don't realloc if asked to do so */
@@ -1313,16 +1312,7 @@ again:
if (list_empty(&fail_head))
goto enable_and_dump;

- failed_type = 0;
- list_for_each_entry(fail_res, &fail_head, list)
- failed_type |= fail_res->flags;
-
- /*
- * io port are tight, don't try extra
- * or if reach the limit, don't want to try more
- */
- failed_type &= type_mask;
- if ((failed_type == IORESOURCE_IO) || (tried_times >= pci_try_num)) {
+ if (tried_times >= pci_try_num) {
free_list(&fail_head);
goto enable_and_dump;
}
--
1.7.7


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